linux-kernel - Re: [RFC] Get rid of SUBARCH

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Date:	Thu, 22 Aug 2013 13:55:20 -0700
From:	David Daney <ddaney.cavm@...il.com>
To:	Rob Landley <rob@...dley.net>, Richard Weinberger <richard@....at>
CC:	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Sam Ravnborg <sam@...nborg.org>,
	Linux-Arch <linux-arch@...r.kernel.org>,
	Michal Marek <mmarek@...e.cz>,
	Ralf Baechle <ralf@...ux-mips.org>,
	Paul Mundt <lethal@...ux-sh.org>,
	Jeff Dike <jdike@...toit.com>,
	Guan Xuetao <gxt@...c.pku.edu.cn>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	the arch/x86 maintainers <x86@...nel.org>,
	linux-kbuild <linux-kbuild@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-m68k <linux-m68k@...ts.linux-m68k.org>,
	Linux MIPS Mailing List <linux-mips@...ux-mips.org>,
	Linux-sh list <linux-sh@...r.kernel.org>,
	uml-devel <user-mode-linux-devel@...ts.sourceforge.net>
Subject: Re: [RFC] Get rid of SUBARCH

On 08/22/2013 01:41 PM, Rob Landley wrote:
> On 08/22/2013 07:58:26 AM, Geert Uytterhoeven wrote:
>> On Wed, Aug 21, 2013 at 9:51 PM, Sam Ravnborg <sam@...nborg.org> wrote:
>> >> > The series touches also m68k, sh, mips and unicore32.
>> >> > These architectures magically select a cross compiler if ARCH !=
>> SUBARCH.
>> >> > Do really need that behavior?
>> >>
>> >> This does remove functionality.
>> >> It allows to build a kernel using e.g. "make ARCH=m68k".
>> >>
>> >> Perhaps this can be moved to generic code? Most (not all!)
>> cross-toolchains
>> >> are called $ARCH-{unknown-,}linux{,-gnu}.
>> >> Exceptions are e.g. am33_2.0-linux and bfin-uclinux.
>> >
>> > Today you can specify CROSS_COMPILE in Kconfig.
>> > With this we should be able to remove these hacks.
>>
>> The correct CROSS_COMPILE value depends on the host environment, not
>> on the target configuration.
>
> Actually it depends on _both_.
>

I think the important issue is not the exact dependencies of the value 
of CROSS_COMPILE, but rather that it varies enough that automatically 
choosing a value based on SUBARCH often gives the wrong result.

Removing SUBARCH and setting CROSS_COMPILE either from the make command 
line (or environment) or the config file, is a good idea because it 
simplifies the build system, makes things clearer, and yields more 
predictable results.

David Daney

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